murbarg-er



(No Mom.)

W. E. MURBARGER.

PIPE WRENGH.

Patented N v. 25, 1890.

VUNITED STATES PATENT OFFICE.

YVILLIAM E. MURBRGER, OF INDIANAPOLIS, INDIANA.

PIPE-'wRENol-l.

SPECIFICATION forming part of Letters Patent No. 441,188, dated November 25, 1890.

Application filed August 19, 1889- Serial Na. 321,214. (No model.)

To all whom, it may cmwern:

Be it known that I, WILLIAM E. MURBAR- GER, of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Pipe-Wrenchesg and I do hereby declare that the following is afull, clear, and exact description thereof,

reference being had to the accompanying drawings, in which like letters and figures refer to like parts.

My invention relates to the construction of pipe-Wrenches; and it consists in the particular arrangement and construction of parts, as hereinafter specified, and will be understood from the following description.

In the drawings, Figure 1 represents a side view of one form of my wrench. Fig. 2 is a vertical longitudinal section of the operative parts. Fig. 3 is a side view of a modified form of my device. Fig. 4: is a vertical longitudinal section of the operative parts thereof` Fig. 5 is a rear view of the projection at the top of the handle with its groove. Fig. 6 is a cross-section on the line y y, Fig. 3.

In detail the Wrench consists of a handle h, one end of which is inserted in an opening in the lower jaw j', and held therein by a pin Z, Which passes loosely through a slot K in the handle, said pin and slot being merely for the purpose of connecting the handle to the Wrench without preventing it from bearing upon the projections p' 192, hereinafter described.

j is the upper jaw, having a shank s, the latter passing through the yoke 1, Which surrounds the lower jaw j', and which is pivoted at 2 to' this yoke.

p is a pawl pivoted at 3 in the extension of the yoke 1, so as to engage With teeth formed on the outer edge of the shank.

s p' is a pressure-spring for holding the pawl in engagement with the teeth.

s p is a pressure-sprin g bearing against the outer edge of the lower jaw and having a bearing on the inside of the front extension of the yoke 1 132 is a projection formed integral with the yoke extending downward and parallel with the shank s, and provides a fulcrum bearing for the upper and inner end of the handle h. 1)' is a similar projection forined on the interior and at the lower end of the lower jaw,

and operates as a fulcrum-bearing for the handle h When pressed outwardly, for the purpose hereinafter described. Thejawj' being pivoted at 2 forms of itself a lever, Which tends to grip the pipe tightly When its lower end, Which forms the long arm of the lever, is pressed away from the shank s. The handle h forms a second lever, with which to operate the first lever or j aw j' Taken together, the parts j' and h forma compound lever, the arms of which may be so proportioned that any desired amount of force may be applied to grip the pipe or other object between the Jaws.

The description above given refers to Figs. l and 2, and that form of the devices operates as follows: The handle h normally stands at an angle With the shank s, and in operating the Wrench, after the jaws have been set so as to grip the pipe, the handle is pulled to the left, taking a position shown. in the dotted lines in Fig. 2. This causes the left-hand edge of the handle to bear against the projection p', compressing the spring s p and operating to raise the left side of the lower jaw toward the upper jaw, such jaw revolving on the pivot 2, and at the same time the upper corner upon the opposite side of the handle bears against the projection pg, which is part of the yoke 1, surrounding the shank of the upper jaw, and this upper jaw being held fiXedly to such yoke by means of the pawl and ratchet or its equivalent device, the shank of such upper jaw is thrown to the right, and the jaw itself is t-hroWn forward and its outer end downward. Therefore, as the lower jaw revolving upon its pivot 2 is carried upward the upper jaw is carried downward by the pressure of the handle on the fulcrum 192, and a firm grip is made upon the pipe, for the harder the pull upon the handle the more pressure is brought against the fulcrum p', forcing the lower jaw up, and upon the opposite side upon the fulcrum 192, bringing the upper jaw down, and as they approach they grip the pipe With a pressure resulting from the compound action of the levers.

The handle hand lower jaw j' together form a powerful compound lever, which, in co-operati'on With the upper jaw, enables me to grasp a pipe or nut With much more firmness IOO than is attainable by the use of the old forms of wrenches in which a simple lever is used.

In Figs. 3 and 4 is shown a modification; but the principle of operation is substantially the same, and the gripping movement of the jaws is accomplished by the same mechanism-namely, the leverage of the handle having its bearings both on the shank and on the lower jaw. In this modification of the device the lower jaw is provided with a yoke e, which is provided with an opening to reoeive the shank of the upper jaw, and on this shank is placed an ordinary nut n for adjusting the jaws at any desired distance. In other words, the looking device in Figs. 3 and 4 is simply the old nut substituted for the ratchet and pawl shown in Figs. 1 and 2. The lower jaw and yoke in this case are integral, and the yoke is fitted loosely upon the nutn, which forms a fulcrum for the jaw, taking the place of the pivot 2 of Figs. 1 and 2. The handle h is mounted in the lower jaw exactly as in the form shown in Figs. 1 and`2, and in moving it to the left hand it bears against the project-ion 19', which is similar to the projection p' in Figs. 1 and 2, and performs exactly the same oflice. The' bearing 292 (shown in Fig. 2) is substituted by making a projection 103 on the-upper end ofl the handle h, which is grooved, as at g, as shown in Fig. 5, so as to receive and bear against the inner edge of the shank s-that is to say, the upper end of the handle instead of bearing against a projection, as shown in Fig. 2, bears directly against the edge of the shank, The same result is accomplished in both cases, the office of the projection 192 in Fig. 2 being to receive the pressure of the handle and take the wear off the edge of the shank. As before stated, the handle h when pulled to the left bears against the projection 1o', throws that end of the lower jaw out, tips up the corresponding upper end of the lower jawj' until it takes the position shown in the dotted lines in Fig. 4, while the upper and projecting end 193 of the handle bears firmly against the edge of the shank, which is integral With the upper jaw, forces it to the right and throws the upper jaw forward and down toward the lower jaw in the position shown in the dotted lines in Fig. 4. It is obvious, therefore, that by the movement of the handle upon the bearingsor fulcrum located on opposite sides of the handle, one integral with the lower and the other integral with the shank of the upper j aw, or with a part connected therewith, the two jaws are forced toward each other, the lower jaw upward and the upper jawdownward,so that the harder you pull on the handle the tighter the grip upon the pipe.

It will be obvious that the principle of my invention may be embodied in various forms of wrenches. Therefore,

Without limiting myself to the precise construction shown, I claim- 1. Inawrench, the combination of the yoke, the inner jaw pivoted to the yoke, the outer jaw having a shank which is longitudinally adjustable in the yoke, and the handle arranged to swing in the inner jaw and bearing against the inner jaw and yoke, Whereby the handle serves as a lever to pry said inner jaw and yoke apart, substantially as described.

2. In a wrench, the jawj, having the shank s, the yoke and means for adjusting the yoke upon the shank, the jaw j', pivoted to the yoke,'and the handle h, arranged as a lever between said yoke and j aw to p-ry them apart, substantially as described.

3. In a Wrench, the jaw j, having the shank s, the yoke and means for adj usting the yoke upon the shank, the j aw j' pivotally attached to the yoke, and the handle h, loosely connected to the lower end of jawj', said jawj' and handle forming a componnd lever, substantially as described.

4. In a wrench, the jawj, having the shank s, the yoke and means for adjusting the yoke upon the shank, the bearing 192 upon the yoke,

at its upper end to the yoke, the handle having the slot K, connected to the jaw by pin l, the opposite sides of said handle being adapted to bear, respectively, upon the yoke and the lower end of j aw j', subst-antially as described.

In witness whereof I have hereunto set my hand this 17th day of August, 1889.

WILLIAM E. MURIARGER. 'Witnessesz O. P. JAooBs, E. B. GRIFFITH.

IOO 

